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Journal Articles Journal of Geophysical Research : Solid Earth Year : 2010

Broadband seismic monitoring of active volcanoes using deterministic and stochastic approaches

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Hiroyuki Kumagai
  • Function : Author
Masaru Nakano
  • Function : Author
Takuto Maeda
  • Function : Author
Hugo Yepes
Pablo Palacios
  • Function : Author
Mario Ruiz
  • Function : Author
Santiago Arrais
  • Function : Author
Mayra Vaca
  • Function : Author
Tadashi Yamashima
  • Function : Author

Abstract

We systematically used two approaches to analyze broadband seismic signals for monitoring active volcanoes: one is waveform inversion of very-long-period (VLP) signals assuming possible source mechanisms; the other is a source location method of long-period (LP) events and tremor using their amplitudes. The deterministic approach of the waveform inversion is useful to constrain the source mechanism and location but is basically only applicable to VLP signals with periods longer than a few seconds. The source location method assumes isotropic radiation of S waves and uses seismic amplitudes corrected for site amplifications. This simple approach provides reasonable source locations for various seismic signals such as a VLP event accompanying LP signals, an explosion event, and tremor associated with lahars and pyroclastic flows observed at five or fewer stations. Our results indicate that a frequency band of about 5-12 Hz and a Q factor of about 60 are appropriate for the determination of the source locations. In this frequency band the assumption of isotropic radiation may become valid because of the path effect caused by the scattering of seismic waves. The source location method may be categorized as a stochastic approach based on the nature of scattering waves. Systematic use of these two approaches provides a way to better utilize broadband seismic signals observed at a limited number of stations for improved monitoring of active volcanoes.
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insu-03596890 , version 1 (04-03-2022)

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Hiroyuki Kumagai, Masaru Nakano, Takuto Maeda, Hugo Yepes, Pablo Palacios, et al.. Broadband seismic monitoring of active volcanoes using deterministic and stochastic approaches. Journal of Geophysical Research : Solid Earth, 2010, 115, pp.1815-1827. ⟨10.1029/2009JB006889⟩. ⟨insu-03596890⟩
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